Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

Why enabling the discard option in crypttab is a security risk ? I understand that unused areas will be replaced by zero. And this way, the NSA ;-) will be able to deduce what part of the hard disk contains something and what part of the hard disk is empty. And also the NSA could deduce the filesystem used. So what ? The data of the hard disk are still encrypted. Probably I am missing something important.

share|improve this question

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.